What are the types for Request, Response and Next in the middleware

[muneeebsheikh]

I'm using typescript as per project requirements and using fastify gateway for researching as a possible alternate for a commercial gateway. While writing middleware, the request, response and next need to have types and yet I could not find them as they are not required in JS and in TS i've specified them as unknown.

Since it is based on fastify, I assume that they use FastifyRequest, FastifyReply interfaces as mentioned here
https://stackoverflow.com/a/63822691

Can you please guide me what are the types because adding these types require me to install fastify also